Nigeria, Oct. 27 -- A 21-day-old baby has died after falling from a fourth-floor apartment window in the village of Vasilyevo, in the Zelenodolsk District of Tatarstan, Russian authorities said.

Officials say the infant was allegedly thrown from the window by her five-year-old sister while the children when their mother reportedly went to visit a friend when the tragedy occurred.

The fall was about 40 feet.

"A criminal case has been opened over the death of the infant," the Russian Investigative Committee said.

Investigators are examining why the children were unsupervised and whether the older child's actions were motivated by jealousy.

Local accounts said passersby heard a child screaming at the window and then saw the baby on the...